The responding photocatalytic wavelength of LaCl3, EuCl 3 , ErCl 3 permeated to TiO2 powder had intensity adsorbance in visible range, owing to the reduction of originate energy that electron transition needed.

• LaCl_3 ,EuCl_3 ,ErCl_3扩渗后的TiO_2的UV-VIS光谱表明在可见区有很强的吸收,说明渗入的稀土有效降低TiO_2电子跃迁所需激发能,从而起到了可见光敏化和助催化剂的作用,红外光谱分析表明偶氮式甲基橙在偶氮双键处开始分解。